CN101478641B - Digital photographing apparatus and method of controlling the same - Google Patents
Digital photographing apparatus and method of controlling the same Download PDFInfo
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- CN101478641B CN101478641B CN200810177294XA CN200810177294A CN101478641B CN 101478641 B CN101478641 B CN 101478641B CN 200810177294X A CN200810177294X A CN 200810177294XA CN 200810177294 A CN200810177294 A CN 200810177294A CN 101478641 B CN101478641 B CN 101478641B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/16—Human faces, e.g. facial parts, sketches or expressions
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/141—Control of illumination
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/61—Control of cameras or camera modules based on recognised objects
- H04N23/611—Control of cameras or camera modules based on recognised objects where the recognised objects include parts of the human body
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/71—Circuitry for evaluating the brightness variation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/72—Combination of two or more compensation controls
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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Abstract
A digital photographing apparatus is provided which can recognize a face even in a dark place, such as under a backlight condition, or in too bright a place, and also provided is a method of controlling the same. According to the method, when a face is not recognized, an exposure value is temporarily adjusted so as to generate an image signal, and a face recognition algorithm is performed from the image signal.
Description
The application requires to be submitted on January 4th, 2008 rights and interests of the 10-2008-0001432 korean patent application of Korea S Department of Intellectual Property, and the full content of this application is contained in this by reference.
Technical field
The present invention relates to a kind of digital photographing apparatus and control method thereof.More particularly, the present invention relates to a kind of digital photographing apparatus and control method thereof of carrying out the face recognition algorithm.
Background technology
When for example because backlight causes when too dark or too bright the face that traditional digital photographing apparatus can not identifying object.In other words, the face recognition algorithm is generally suitable for only carrying out in limited environment.
Summary of the invention
The invention provides a kind of digital photographing apparatus and control method thereof that can effectively utilize the face recognition algorithm.
According to embodiments of the invention, a kind of method of control figure photographic equipment is provided, described method comprises: the face by reference object produces the first picture signal; Carry out the face recognition algorithm by using the first picture signal; In the time can not identifying face from the first picture signal, adjust exposure value; Face by reference object under the exposure value of adjusting produces the second picture signal; Carry out the face recognition algorithm by using the second picture signal.
In the step of adjusting exposure value, in the time can not identifying face because of the brightness value of the first picture signal greater than the maximum of the normal brightness value that is used for identification face or normal brightness value scope, exposure value is adjusted into the first exposure value less than current exposure value, when because the brightness value of the first picture signal face can not be identified less than the minimum value of normal brightness value or normal brightness value scope the time, exposure value is adjusted into the second exposure value greater than current exposure value.
The first exposure value or the second exposure value can equal the standard exposure value or corresponding to standard exposure value scope.
In the step of adjusting exposure value, exposure value can be converted into has at least one impulse form.The first picture signal can be produced not inputting in the stage that exposure value is converted to the signal with impulse form, in the stage of the described signal of input, the second picture signal can be produced.
Described method also comprises: show the first picture signal under preview mode.
After carrying out the face recognition algorithm by use the second picture signal, described method also comprises: the face based on identification determines exposure value; Produce the 3rd picture signal by reference object under the exposure value of determining.
Can determine exposure value according to the first release signal, and can be by producing the 3rd picture signal according to the second release signal reference object.
Described method also comprises: show the 3rd picture signal under reproduction mode.
According to another embodiment of the present invention, provide a kind of digital photographing apparatus, described digital photographing apparatus comprises: image-generating unit, by face's generation picture signal of reference object; The face recognition device is from picture signal identification face; The first exposure control unit, when the face recognition device can not be identified face, the control exposure value.
In the time can not identifying face because of the brightness value of picture signal greater than the maximum of the normal brightness value that is used for identification face or normal brightness value scope, the first exposure control unit can be adjusted into exposure value the first exposure value less than current exposure value, in the time can not identifying face because of the brightness value of picture signal less than the minimum value of normal brightness value or normal brightness value scope, the first exposure control unit can be adjusted into exposure value the second exposure value greater than current exposure value.
Described digital photographing apparatus also comprises the second exposure control unit, and when the face recognition device identified the face of object, described the second exposure control unit was determined exposure value based on the face of identification.
Described digital photographing apparatus also comprises operating device, and described operating device is inputted the first release signal so that the second exposure control unit is determined exposure value, and inputs the second release signal in order to produce the 3rd picture signal.
Image-generating unit can produce the first picture signal under current exposure value, produce the second picture signal under the exposure value of being adjusted by the first exposure control unit, produces the 3rd picture signal under the exposure value of being determined by the second exposure control unit.
The face recognition device can comprise: the face recognition determiner, and can determine from the face of the first picture signal identifying object; Face recognition algorithm actuator is identified face by carrying out the face recognition algorithm from the second picture signal.
Described digital photographing apparatus also comprises display, and described display shows the first picture signal under preview mode, shows the 3rd picture signal under reproduction mode.
Description of drawings
By the detailed description of reference accompanying drawing to exemplary embodiment of the present invention, above-mentioned and other characteristics of the present invention and advantage will become apparent, wherein:
Fig. 1 is the block diagram that illustrates according to the example of the digital photographing apparatus of the embodiment of the invention;
Fig. 2 is the block diagram of example that the face recognition device of the digital photographing apparatus shown in Fig. 1 is shown;
Fig. 3 is the flow chart that illustrates according to the example of the method for the control figure photographic equipment of the embodiment of the invention;
Fig. 4 A and Fig. 4 B are for the diagram of describing when the example of the embodiment when the method shown in Fig. 3 does not identify face;
Fig. 5 is the figure according to the example of the method for adjusting exposure value when not identifying face in the method shown in Figure 3 of the embodiment of the invention;
Fig. 6 A and Fig. 6 B are for describing when the diagram in the example of the embodiment of the adjustment of the method shown in Fig. 3 exposure value when carrying out face recognition;
Fig. 7 is for the diagram of describing when the example of the embodiment when the method for Fig. 3 is adjusted exposure value based on the face that identifies;
Fig. 8 and Fig. 9 are the figures of the example of the method for adjusting exposure value when not identifying face in the method shown in Figure 3 according to another embodiment of the present invention.
Embodiment
Now, describe more fully with reference to the accompanying drawings exemplary embodiment of the present invention in detail, wherein, exemplary embodiment of the present invention is shown in the drawings.When description is of the present invention, will only describe and understand the needed part of operation of the present invention, may cause unclear other parts of main points of the present invention to be omitted.
The term that uses in detailed specification and claim or word should not be interpreted as having definition traditional or dictionary, express the meaning and the concept that is suitable for technical elements of the present invention of the present invention and should be interpreted as having being best suited for.
Fig. 1 is the block diagram that illustrates according to the example of the digital photographing apparatus 100 of the embodiment of the invention.The parts of digital photographing apparatus 100 will be described according to the operation of the parts of digital photographing apparatus 100.
Processing about reference object, pass zoom lens 111 and condenser lens 113 as the optical system of image-generating unit 110 from the light of object, light quantity is adjusted in opening and closing according to iris 115, and then light arrives the light receiving surface of imaging device 117, thereby forms the image of object.The image that forms at the light receiving surface of imaging device 117 is processed through opto-electronic conversion and is converted into electrical picture signal.
Imaging device 117 can be charge coupled device (CCD) or the cmos image sensor (CIS) that light signal is converted to the signal of telecommunication.Iris 115 is being opened during the normal condition or when the first release signal of partly pressing the generation of release-push (not shown) by reception is carried out auto-focusing algorithm, and can carry out exposure-processed by receiving the second release signal of pressing the release-push generation fully.
The position philosophy of zoom lens 111 and condenser lens 113 is by zoom lens driver 112 and 114 controls of condenser lens driver.For example, when producing the wide-angle zoom signal, the visual angle broadens along with the reducing of focal length of zoom lens 111, and when producing the telephoto zoom signal, the visual angle narrows down along with the increase of the focal length of zoom lens 111.After the position of determining zoom lens 111, adjust the position of zoom lens 113, thereby the visual angle is not subjected to the impact of the position of condenser lens 113.Be controlled to the opening and closing of iris 115 by iris driver 118, and control the photosensitivity of imaging device 117 by imaging device controller 118.
Zoom lens driver 112, condenser lens driver 114, iris driver 116 and imaging device controller 118 are according to controlling corresponding parts by CPU (CPU) 200 based on the result of the operation of the execution such as exposure information, focus information.
About producing the process of picture signal, the picture signal of exporting from imaging device 117 is imported into image-signal processor 120.When the picture signal that receives from imaging device 117 was analog signal, image-signal processor 120 was converted to digital signal with picture signal, and digital signal is carried out various images process.After such image was processed, picture signal was temporarily stored in the memory 130.
Particularly, image-signal processor 120 (is for example processed by executive signal, Automatic white balance, automatic exposure and Gamma correction) improve the quality of image, view data being converted to the vision that is suitable for the people, and the picture quality output image signal to improve.In addition, image-signal processor 120 is carried out the image processing that strengthens such as color filter array interpolation, color matrix, color correction and color.
Memory 130 comprises: the program storage (not shown), with the program of the power supply of digital photographing apparatus 100 irrespectively being stored about the operation of digital photographing apparatus 100; The main storage (not shown), when to digital photographing apparatus 100 power supply, storing image data provisionally.
Program storage storage operation program and various application program, wherein, described operation sequence operand word photographic equipment 100.In addition, CPU200 is according to each parts of program control that are stored in the program storage.
The interim storage of main storage is from the picture signal of image-signal processor 120 or additional storage 140 outputs.
Main storage can be independent of the power supply of digital photographing apparatus 100 is directly connected to power supply 160.Therefore, being pre-stored in code in the program storage can be copied to main storage or be changed to the code that can be carried out by main storage, with guiding (boot) digital photographing apparatus 100 rapidly, and when rebooting digital photographing apparatus 100, can read rapidly the data that are stored in the main storage.
The picture signal that is stored in the main storage is output to display driver 155, then is converted into analog signal and is converted into simultaneously the optimized image signal that will be shown.In addition, show the picture signal of conversion at display 150, thereby shown with predetermined image.During screening-mode, display 150 can be used as determining the view finder of coverage by showing continuously the picture signal that is obtained by imaging device 117.The example of display 150 is varied, comprises liquid crystal display (LCD), Organic Light Emitting Diode (OLED) and electrophoretic display apparatus (EDD).
About recording the process of the picture signal that produces above, picture signal is temporarily stored in the memory 130, and the various types of information about picture signal are stored in the memory 130 together with picture signal simultaneously.In addition, picture signal and described information are imported into compression/decompression unit 145.The optimal compression that is used for storage that compression/decompression unit 145 is carried out by compressor circuit is processed (that is, coding is processed, for example JPEG) and is formed image file, and described image file is stored in the additional storage 140.
The example of additional storage 140 is varied, (for example comprise the semiconductor memory of fixed type, external flash), semiconductor memory (for example can be card type or clavate and the cassette flash memory that can freely remove from device) and magnetic storage medium (for example, hard disk or floppy disk).
About the processing of reproduced image, image file compressed and record is imported into compression/control unit 145 in additional storage 140, and then decompressed circuit carries out decompression (that is, decoding), thereby extracts picture signal from image file.Then, picture signal is output to memory 130.Picture signal is temporarily stored in the memory 130, and is reproduced as predetermined image through display driver 155 at display 150.
Now with reference to Fig. 2 face recognition device 170 is described in more detail.Fig. 2 is the block diagram of example that the face recognition device 170 of the digital photographing apparatus 100 shown in Fig. 1 is shown.
With reference to Fig. 2, face recognition device 170 comprises face recognition determiner 171, and described face recognition determiner 171 determines whether the face of identifying object.Face recognition determiner 171 determines whether the face of identifying object based on the first picture signal.The first picture signal is the picture signal by initially identifying object generation.By reference object, producing for before the picture signal of recording and reconstruction, under preview mode, produce the first picture signal.During preview mode, show the first picture signal at display 150, to determine coverage.
When the brightness value of the first picture signal less than can identify the brightness value of face the time, face recognition determiner 171 can be determined to identify face.Perhaps, when by carry out the face recognition algorithm do not extract face skin color or with the corresponding zone of skin color in when not detecting eyes or mouth, face recognition determiner 171 can be determined to identify face.
Face recognition device 170 also comprises the face recognition algorithm actuator 175 of carrying out the face recognition algorithm.Face recognition algorithm actuator 175 faces from the second picture signal identifying object.The second picture signal is to carry out the data value of the picture signal processing of adjusting exposure value when not recognizing face from the first picture signal.The second picture signal also is to produce for the picture signal that produces under preview mode before the picture signal of recording and reconstruction.Produce the second picture signal by using the exposure value that is used for face recognition, and can not show the second picture signal at display 150.When adjusting exposure value by the signal of inputting a plurality of impulse forms, in the stage of the signal of input pulse form, produce the second picture signal, in the stage of the signal that does not have the input pulse form, produce the first picture signal.Therefore, when when display 150 shows the second picture signal, can show scintigram picture (flickering image).This is not only bad for determining the object that is taken, and has increased user's eye fatigue.
By extract skin-coloured regions from picture signal, based on the change Extracting contour of brightness the skin-coloured regions of extracting and determine in the eyes of experimental measurement and mouth zone, whether have two eyes and a mouth, face recognition algorithm actuator 175 is carried out the face recognition algorithms.This only is an example, not only can identify face by the location positioning geometric element according to eyes and mouth, and can be by then comparing or be associated to extract feature with identification face by the projection to face image and previously stored face image from geometric element reflection face image.Perhaps, can and the template image of whole face be shown by face image relatively, and the correlation of analyzing between face image and the template image is identified face.Perhaps, can identify face by using about the study of neural net and the information of identification via the study recognizer of end user's artificial neural networks.
Return with reference to example shown in Figure 1, digital photographing apparatus 100 comprises exposure control unit 180.Exposure control unit 180 comprises the first exposure control unit 181 of identifying face and the second exposure control unit 185 of adjusting exposure value based on the face of identification.
Particularly, when face recognition determiner 171 is determined can not be from the first face signal identification face the time, the first exposure control unit 181 is adjusted into the current exposure value of the first picture signal less than the first exposure value of current exposure value or greater than the second exposure value of current exposure value.Therefore, image-signal processor 120 is by producing the second picture signal according to the first exposure value or the second exposure value processing picture signal.
The second exposure control unit 185 is determined exposure value based on face recognition algorithm actuator 175 from the face that the second picture signal is carried out the face recognition algorithm identified.Can determine exposure value by using the automatic exposure algorithm, described automatic exposure algorithm is from the brightness of the picture signal detected object that receives under preview mode, and automatically adjusts the brightness of object, so that the brightness of object approaches the brightness of expectation.Can be by producing the 3rd picture signal with the exposure value of determining.Produce the 3rd picture signal to carry out recording and reconstruction by reference object.Produce the 3rd picture signal, the picture signal that makes the user obtain to expect by adjusting photosensitivity, shutter speed or iris value according to definite exposure value.Determine exposure value according to the first release signal, and by producing the 3rd picture signal according to the second release signal reference object.
CPU 200 operates according to the operating system and the application program that are stored in the memory 130, and the result of storage operation provisionally, and according to the corresponding parts of output control of operation is with operand word photographic equipment 100 as described above.
Therefore, when in the time face can not being identified under half-light (for example, backlight) or the too bright light, adjust exposure value to carry out the face recognition algorithm.Therefore, can increase for the scope of carrying out the face recognition algorithm.
Fig. 3 is the flow chart that illustrates according to the example of the method for the control figure photographic equipment of the embodiment of the invention.
With reference to Fig. 3, S11 carries out screening-mode in operation, and S12 selects face recognition function in operation.
Then, produce the first picture signal at operation S13 by reference object.The first picture signal is the picture signal of inputting through image-generating unit under preview mode.
At operation S14, determining whether can be from the face of the first picture signal identifying object.Can whether have for the normal brightness value of identification face or noly within the normal brightness scope, carry out such determining by determining the first picture signal.
For example, in Fig. 4 A, in display 150 demonstrations first picture signal of digital photographing apparatus 100.Can see that display 150 is presented at the image of the girl under the half-light.The digital photographing apparatus of Fig. 4 A is the example of embodiment of the digital photographing apparatus 100 of Fig. 1.The back of digital photographing apparatus 100 comprises: display 150, power knob 191, be used for carrying out shutter release button 192, wide-angle zoom and telephoto zoom button 193 and the various function button 194 of taking to carry out recording and reconstruction.
In Fig. 4 A, because the dark images on the display 150, therefore there is not the face of identifying object.
Fig. 4 B illustrates the histogrammic example of the first picture signal of the image that shows on the display 150 that is implemented in Fig. 4 A.According to the histogram of Fig. 4 B, can see that the first picture signal comprises a lot of dark colors.Prepare to identify the histogrammic database of face based on empirical value, when the histogram of the first picture signal does not belong to this database, can determine to identify face.In addition, can be stored in the database individually according to the histogram of exposure value with the first picture signal.For example, can be stored in the database according to dark color component and the bright color component histogram with the first picture signal.Therefore, when the histogram of the first picture signal illustrates a lot of dark color component, increase exposure value; When the histogram of the first picture signal illustrates a lot of bright color component, reduce exposure value.For example, when because the brightness value of the first picture signal face can not be identified greater than the maximum of the normal brightness value that is used for identification face or normal brightness value scope the time, exposure value is adjusted into the first exposure value less than current exposure value; When because the brightness value of the first picture signal face can not be identified less than the minimum value of normal brightness value or normal brightness value scope the time, exposure value is adjusted into the second exposure value greater than current exposure value.
With reference to Fig. 3, in the time can not identifying face from the first picture signal, S15 adjusts exposure value in operation.At operation S16, produce the second picture signal by adjusting exposure value from the first picture signal.When can be from the face of the first picture signal identifying object, S18 carries out the face recognition algorithm in operation.
For example, according to the histogram of the first picture signal shown in Fig. 4 B, in the time face can not being identified because dark color component is too many, increase exposure value.Particularly, with reference to Fig. 5, exposure value is increased to 1EV from 0EV.In Fig. 5, during very first time section, produce the first picture signal, during the second time period, produce the second picture signal of processing through picture signal by increasing exposure value.Adjust exposure value with impulse form, only during the second time period, increase provisionally exposure value.Then, and when exposure value returns original value (, during the 3rd time period), produce the first picture signal.Here, the first picture signal that can be during display 150 showed for the first or the 3rd time periods.If obtain the second picture signal by the exposure value that increases between the first and the 3rd time period, then can show the image of flicker, therefore only show the first picture signal at display 150.The present invention has described increases or reduces a gray scale (gradation) with exposure value.Then, the invention is not restricted to this embodiment.The present invention includes: exposure value can be changed into the standard exposure value or within standard exposure value scope.
Fig. 6 A and Fig. 6 B illustrate respectively the second picture signal to be displayed on the example of the image on the display 150 and the histogrammic example of the second picture signal.Produce the second picture signal by from the first picture signal exposure value being increased to 1EV, and the second picture signal can be presented at bright image on the display 150.Referring to the histogram of the second picture signal, can see that the second picture signal comprises a lot of bright color components.
At operation S17, can again determine from the face of controlled the second picture signal identifying object of top exposure value.If determine to identify face at operation S17, then identify face at operation S18 by carrying out the face recognition algorithm from the second picture signal.Then, determine exposure value based on the face that identifies at operation S19, and produce the 3rd picture signal according to the exposure value of determining at operation S20.If determine to identify face at operation S17, then again adjust exposure value at operation S15.
Fig. 7 is illustrated in the diagram that shows the example of the 3rd picture signal that is exposed based on the face that identifies on the display 150.According to the example of Fig. 7, can show from the 3rd picture signal the image of the clearly face of object.
Exposure value by adjusting the first picture signal, exchange second picture signal of haveing suffered exposure value and carry out the face recognition algorithm and adjust the exposure value of the first picture signal based on the face of identification, can obtain the image of the clearly face of object.In other words, can be by using the face recognition algorithm, the image transitions that will take under half-light (for example, backlight) or too bright light is to have the clearly image of the face of object.
Fig. 8 and Fig. 9 are the figures for the example of describing the method for adjusting exposure value when method shown in Figure 3 does not identify face according to another embodiment of the present invention.
Particularly, Fig. 8 is the image of adjusting the method for exposure value for describing in the time can not identifying face because image is too bright.For example, when the first picture signal realizes a lot of bright color component is arranged, by exposure value is reduced a gray scale, then processes the first picture signal by basis-1EV and produce the second picture signal from 0EV to-1EV.Then, carry out the face recognition algorithm from the second picture signal.
In the example of Fig. 9, identify face by then gray value of exposure value increase is reduced exposure value a gray value.Perhaps, also can then gray value of exposure value increase be identified face by exposure value being reduced a gray value.Particularly, if can not identify face, then the exposure value with the first picture signal is increased to 1EV from 0EV, to produce the second picture signal, then carries out the face recognition algorithm from the second picture signal.Then, the exposure value of the first picture signal is reduced to-1EV from 0EV, to produce the second picture signal, then carries out the face recognition algorithm.Therefore, by carrying out the face recognition algorithm according to the method using exposure value shown in Fig. 9, and need not determine to increase or the exposure value that reduces the first image is identified face.
The invention provides a kind of digital photographing apparatus and control method thereof, it can carry out the face recognition algorithm by adjust exposure value under half-light (for example, backlight) or too bright light.The image that therefore, can obtain to expect by effectively carrying out the face recognition algorithm.
Although specifically shown with reference to exemplary embodiment of the present invention and described the present invention, but will be understood by those skilled in the art that, in the situation that does not break away from the spirit and scope of the present invention that claim limits, can carry out various changes on form and the details to it.
Claims (12)
1. the method for a control figure photographic equipment, described method comprises:
Face by reference object produces the first picture signal;
Carry out the face recognition algorithm by using the first picture signal;
In the time can not identifying face from the first picture signal, adjust exposure value;
Face by reference object under the exposure value of adjusting produces the second picture signal;
By using the second picture signal to carry out the face recognition algorithm,
Wherein, after carrying out the face recognition algorithm by use the second picture signal, described method also comprises: the face based on identification determines exposure value; Produce the 3rd picture signal by reference object under the exposure value of determining,
Wherein, determine exposure value according to the first release signal, and by producing the 3rd picture signal according to the second release signal reference object.
2. the method for claim 1, wherein, in the step of adjusting exposure value, in the time can not identifying face because of the brightness value of the first picture signal greater than the maximum of the normal brightness value that is used for identification face or normal brightness value scope, exposure value is adjusted into the first exposure value less than current exposure value, when because the brightness value of the first picture signal face can not be identified less than the minimum value of normal brightness value or normal brightness value scope the time, exposure value is adjusted into the second exposure value greater than current exposure value.
3. method as claimed in claim 2, wherein, the first exposure value or the second exposure value equal the standard exposure value or corresponding to standard exposure value scope.
4. the method for claim 1, wherein in adjusting the step of exposure value, exposure value is converted into the form with at least one pulse.
5. method as claimed in claim 4 wherein, not inputting generation the first picture signal in the stage that exposure value is converted to the signal with impulse form, produces the second picture signal in the stage of the described signal of input.
6. the method for claim 1 also comprises: show the first picture signal under preview mode.
7. the method for claim 1 also comprises: show the 3rd picture signal under reproduction mode.
8. digital photographing apparatus comprises:
Image-generating unit is by face's generation picture signal of reference object;
The face recognition device is from picture signal identification face;
The first exposure control unit, when the face recognition device can not be identified face, the control exposure value;
The second exposure control unit, when the face recognition device identified the face of object, described the second exposure control unit was determined exposure value based on the face of identification;
Operating device, described operating device are inputted the first release signal so that the second exposure control unit is determined exposure value, and input the second release signal in order to produce the 3rd picture signal.
9. digital photographing apparatus as claimed in claim 8, wherein, in the time can not identifying face because of the brightness value of picture signal greater than the maximum of the normal brightness value that is used for identification face or normal brightness value scope, the first exposure control unit is adjusted into the first exposure value less than current exposure value with exposure value, when because the brightness value of picture signal can not identify face less than the minimum value of normal brightness value or normal brightness value scope the time, the first exposure control unit is adjusted into the second exposure value greater than current exposure value with exposure value.
10. digital photographing apparatus as claimed in claim 8, wherein, image-generating unit produces the first picture signal under current exposure value, produce the second picture signal under the exposure value of being adjusted by the first exposure control unit, produces the 3rd picture signal under the exposure value of being determined by the second exposure control unit.
11. digital photographing apparatus as claimed in claim 10, wherein, the face recognition device comprises:
The face recognition determiner, can determine from the face of the first picture signal identifying object;
Face recognition algorithm actuator is identified face by carrying out the face recognition algorithm from the second picture signal.
12. digital photographing apparatus as claimed in claim 11 also comprises display, described display shows the first picture signal under preview mode, shows the 3rd picture signal under reproduction mode.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| US8290291B2 (en) | 2012-10-16 |
| US20090175511A1 (en) | 2009-07-09 |
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| CN101478641A (en) | 2009-07-08 |
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